The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 16, 1982
Filed:
May. 30, 1980
Hiroyuki Kobayashi, Kawasaki, JP;
Masafumi Hashimoto, Kawasaki, JP;
Matsushita Electric Industrial Company, Limited, Osaka, JP;
Abstract
A light-emitting semiconductor device of the type having a substrate, a first layer of a semiconductor on the substrate and a second layer of a different conductivity on the first layer. The second layer is selectively voided so as to give a recess and leave the first layer uncovered in a region serving as the bottom of the recess. An ohmic electrode layer is selectively formed on the second layer so as to extend into the recess and contact with the uncovered region of the first layer, and another ohmic electrode layer is selectively formed on the second layer so as to be separated from the former electrode layer. A solder bump is built up on the first electrode layer to fill up the recess and another solder bump on the second electrode layer so as to be separated from the former solder bump. Selective voiding of the second layer is accomplished by initially covering the entire area of the first layer with the second layer and then selectively slotting the second layer to a depth greater than the thickness of the second layer.